Patent information
IP India · live recordAbstract
A sparkplug is disclosed. The sparkplug (12) comprises a ground electrode 22 and a central electrode assembly. The ground 5 electrode 22 is mounted on an insulator assembly 14. The ground electrode 22 is welded to metal housing 23 which has external threads 24 for fitting the sparkplug on an engine. The central electrode assembly comprising a central electrode 10. The sparkplug is characterized in manner such that the 10 central electrode 10 comprises a hollow portion 16; and firing tip portion 18. The hollow portion 16 of the central electrode located within the insulator assembly 14 in a manner such that the hollow portion 16 is aligned with the external threads 24 of the metal housing 23 so as to form a heat transfer path 26 from the firing tip portion 18 to the hollow portion 15 16 to the external threads 24.
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Claims:1. A central electrode (10) for a sparkplug (12), said 5 central electrode (10) provided within the insulator assembly (14) of said sparkplug (12), said central electrode (10) comprising - a hollow portion (16); and - firing tip portion (18), 10 said hollow portion comprising an evaporator section (16a) and a filler section (16b); said firing tip portion (18) is the part of the central electrode (10) extending from said insulator assembly (14) to form a firing tip (16) of said central electrode. 2. The central electrode (10) as claimed in claim 1, wherein said filler section (16b) is filled with a fluid having low melting point. 3. The central electrode (10) as claimed in claim 2, wherein said low melting point fluid may be at least one chosen from a group of low 20 melting points fluid such as sodium, potassium, cesium and the like. 4. The central electrode (10) as claimed in claim 1, wherein said evaporator section (16a) comprises a wick structure formed by a sintering process. 5. A sparkplug (12) comprising a ground electrode (22) and a central electrode assembly, said ground electrode (22) welded on metal housing (23) mounted on an insulator assembly (14), said metal housing (23) having external threads (24) for fitting said sparkplug on an engine, said central electrode assembly comprising 5 a central electrode (10), characterized in that said central electrode (10) comprising - a hollow portion (16); and - firing tip portion (18), 10 said hollow portion (16) of said central electrode located within said insulator assembly (14) in a manner such that the hollow portion (16) is aligned with the external threads (24) of said metal housing (23) so as to form a heat transfer path (26) from said firing tip portion (18) to said hollow portion (16) to said external threads (24). , Description:A sparkplug is disclosed. The sparkplug (12) comprises a ground electrode 22 and a central electrode assembly. The ground 5 electrode 22 is mounted on an insulator assembly 14. The ground electrode 22 is welded to metal housing 23 which has external threads 24 for fitting the sparkplug on an engine. The central electrode assembly comprising a central electrode 10. The sparkplug is characterized in manner such that the 10 central electrode 10 comprises a hollow portion 16; and firing tip portion 18. The hollow portion 16 of the central electrode located within the insulator assembly 14 in a manner such that the hollow portion 16 is aligned with the external threads 24 of the metal housing 23 so as to form a heat transfer path 26 from the firing tip portion 18 to the hollow portion 15 16 to the external threads 24.